We're back up! I haven't had much luck getting the Scirra Arcade to do my bidding so I've reverted hosting back to my site. It can be found at: http://wrathinc.com/play-now/ (no ads)
Recall that if you're getting a black box or an old version that's still in maintenance you likely need to refresh your browsers cache.
mannygill99 The server costs were actually very cheap! The trick was finding a shared hosting provider that didn't ban game hosting. I ended up with Veerotech after shopping around for quite a while and including a domain name (which I bought from a separate provider) it totaled around $30 for 3 months or so of hosting. Setting up the pages themselves was a bit of a learning experience, even with a CMS. Honestly though I think the Scirra Arcade would probably be a very good substitute most of the time, and for no cost.
A final note to those that squeeze in a game tonight, I don't recommend tabbing out of the game while in Hero Select. Besides, the game is better in full screen anyway.
EDIT: I'm off to bed. Evil Voulk will be back with his bag of quest rewards in the morning. Don't have too much fun without me.